Preparation method of dolomite tailing bricks

Abstract

The invention relates to a preparation method of dolomite tailing bricks, solving the problems of low forming compactness, low demolding perfectness ratio, low initial strength of brick blanks and difficult practical application existing in brick manufacture because of high water and slurry contents and fine granularity of traditional dolomite tailings. The preparation method comprises the following steps of: (1) sieving impurities with size of larger than 5mm in dolomite tailing slurry, naturally airing or drying with equipment to obtain dolomite tailings with the water content of smaller than 5 percent; (2) grinding and uniformly mixing 9-10.8 percent by weight of firming agent, 81-82.93 percent by weight of dolomite tailings and 6.27-10 percent by weight of water; and (3) conveying themixed mixture into a mold, pressing and forming to obtain a brick blank and culturing. The invention has extremely simple process; and the prepared tailing blocks have high forming compactness and demolding perfectness ratio, high initial strength of brick blanks and various excellent performance as well as waterproof performance, and can be used as bearing bricks, and the like.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a preparation method of dolomite tailings bricks. Background technique [0002] In the mines that mine and produce dolomite products, about 10% of the raw ore output is produced as dolomite tailings through the processes of crushing, screening, and washing of the raw ore. This type of dolomite tailings is the pulp produced after the mine is washed , the color is yellow mud color, loose and fine-grained or muddy after drying, the maximum mud content and mud lump content are up to 90%, and may also contain rhizomes, stones, etc. The typical particle size of dolomite tailings is as follows: (the following percentages is the percentage by weight, and the specific gravity is dry weight) [0003] [0004] Dolomite tailings are different from ordinary tailings in that they have the characteristics of high water content, high mud content, and fine particle size. When preparing...

AI Technical Summary

Problems solved by technology

[0004] Dolomite tailings are different from ordinary tailings in that they have the characteristics of high water content, high mud content, and fine particle size. When preparing tailings bricks, high mud content in raw materials will lead to mud agglomeration, and mud lumps will be mixed into tailings bricks to form Cavities and weak surfaces affect the antifreeze and impermeability of the tailings; while the fine particle size will increase the total surface area of ​​the tailings particles, the mixed cementitious material is difficult to wrap and stick to the tailings particles, resulting in no formation between the particles. adequate bond strength

[0005] The molding of fine aggregates is a current technical problem. The hardness, strength and dry shrinkage performance of tailings bricks made by ordinary mixing and molding methods are difficult to meet the requirements, and often have low molding density and low demoulding integrity. Problems such as low initial strength of adobe

Therefore, this kind of tailings has not been used so far, and being piled up in the tailings pond not only occupies land resources, but also forms a dangerous source of safety hazards and pollution to the environment, and requires financial, material and manpower resources, often affecting the tailings pond for maintenance

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